is there anywhere that gives the meaning of the columns in chirp?

CHIRP, like any other programming software, assumes the user knows what
he wants to put into his radio. It's rather dangerous for you to be
transmitting on amateur or commercial frequencies without knowing the
details of what you have told your transceiver to do. That said, I just
cooked up a description of these fields:

http://chirp.danplanet.com/projects/chirp/wiki/MemoryEditorColumns

It won't teach you what to put in the columns. For that, you probably
want an elmer or some other educational reference material. However, in
support of understanding exactly how CHIRP interprets each, that guide
should help.